Color

#040f8b

#040f8b
hex#040f8b
rgbrgb(4, 15, 139)
hslhsl(235, 94%, 28%)
oklchoklch(0.301 0.19 265.1)
Closest name: darkblue (#00008b)Relative luminance 0.0223

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#8b7f04

#04538b · #3c048b

#8b040f · #0f8b04

Split-complementary

Open in tool →

#8b3c04 · #538b04

#8b0453 · #8b7f04 · #048b3c

Contrast

#040f8b as textRatioAAAA largeAAAFix
Aaon white
14.52:1passpasspassPasses AAA — no fix needed.
Aaon black
1.45:1failfailfail
  • AA: use #5764fa as the text (4.61:1)
  • AAA: use #838dfb as the text (7.17:1)
  • AA: or shift the background to #919191 (4.61:1)
  • AAA: or shift the background to #b5b5b5 (7.08:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #040f8b as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Fonts for this mood

#040f8b reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #040f8b
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #040f8b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/040f8b-9e9cc4-df8d4e-241f2d-e9eef1?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md